Past Members

Sabine Harribey

I was a PhD student at Heidelberg University and Ecole Polytechnique Paris, under the supervision of Razvan Gurau, Dario Benedetti and Christoph Kopper. During the first part of my PhD, I worked in the mathematical physics group at CPHT, Ecole Polytechnique. During the second part, I worked in the group of Razvan Gurau at ITP, Heidelberg University.

Before this, I did my Bachelor and Master at Ecole Normale Supérieure in Lyon from where I graduated in 2018. I did my master thesis under the supervision of Dimitrios Tsimpis about the Computation of the four-point amplitude at one-loop order in bosonic string theory.

My research interests are in quantum field theories, renormalization, large-N theories and non-perturbative phenomena. More precisely, the goal of my PhD thesis, entitled Renormalization in tensor field theories and the melonic fixed point, was to study the renormalization group flow of tensor field theories and establish the existence of a new kind of CFT at the fixed point, called melonic CFT. I then focused on studying these melonic CFTs in detail as well as the class of models exhibiting such a melonic fixed point.

My CV can be found here.

Matteo Maria Maglio

My research activity focused on studying conformal field theories regarding their properties in momentum space and their application in different areas of Theoretical Physics. In addition, to deepen the study of conformal field theories and their applications, I am mainly interested in cosmology, gravity and scattering amplitudes and the possible links to establish between them.

Luca Lionni

I was a postdoc in Razvan Gurau’s group. A few keywords describing my research:

– Random matrices and random tensors
– Geometry and combinatorics of combinatorial maps and higher dimensional cell structures
– The search for higher dimensional universality classes of random geometry, a problem which arises in quantum gravity
– Applications of the technics and results from the above in other physics and math topics: quantum information, enumerative geometry, SYK-like models, turbulence…

More precisely, some projects I worked on: the combinatorics of higher order free cumulants, and the generalization of the theory of free probability for random tensors; integrals over tensor products of unitary matrices and their applications in quantum information; a generalization of constellations and Hurwitz numbers in dimension 3, which count certain branched coverings of the 3-sphere.

My papers on arxiv.

Master's Students

We were the master's students of Rǎzvan Gurǎu's group (from left to right): Leena Tharwat, Daniel Tieck Roldán, Niels Gehrig, Melda Akyazi, and Miao Hu.

Leena and Niels were supervised by Carlos Pérez Sánchez. Both were concentrated on investigating the functional renormalization of tensor models. While Niels was working on describing the Wetterich equation in terms of Graph operations and developing symbolic calculation, Leena was more focused on discretized models of gravity.

Daniel was supervised by Matteo Maria Maglio and was dealing with Persistent Symmetry Breaking on tensor models.

Melda was supervised by Rǎzvan Gurǎu and worked on the spiked tensor model, i.e. a model of the type "noise + signal" with the noise being represented by a random tensor.

Miao's supervisor was Luca Lionni and his research went in the direction of randomized measurements of multipartite entanglement with cumulants computed from Weingarten calculus.